io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker Maven / Gradle / Ivy
/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.http.websocketx;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelOutboundInvoker;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.EmptyHttpHeaders;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpClientCodec;
import io.netty.handler.codec.http.HttpContentDecompressor;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpObject;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestEncoder;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.HttpResponseDecoder;
import io.netty.handler.codec.http.HttpScheme;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.util.NetUtil;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.internal.ObjectUtil;
import java.net.URI;
import java.nio.channels.ClosedChannelException;
import java.util.Locale;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
/**
* Base class for web socket client handshake implementations
*/
public abstract class WebSocketClientHandshaker {
private static final String HTTP_SCHEME_PREFIX = HttpScheme.HTTP + "://";
private static final String HTTPS_SCHEME_PREFIX = HttpScheme.HTTPS + "://";
protected static final int DEFAULT_FORCE_CLOSE_TIMEOUT_MILLIS = 10000;
private final URI uri;
private final WebSocketVersion version;
private volatile boolean handshakeComplete;
private volatile long forceCloseTimeoutMillis = DEFAULT_FORCE_CLOSE_TIMEOUT_MILLIS;
private volatile int forceCloseInit;
private static final AtomicIntegerFieldUpdater FORCE_CLOSE_INIT_UPDATER =
AtomicIntegerFieldUpdater.newUpdater(WebSocketClientHandshaker.class, "forceCloseInit");
private volatile boolean forceCloseComplete;
private final String expectedSubprotocol;
private volatile String actualSubprotocol;
protected final HttpHeaders customHeaders;
private final int maxFramePayloadLength;
private final boolean absoluteUpgradeUrl;
protected final boolean generateOriginHeader;
/**
* Base constructor
*
* @param uri
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param version
* Version of web socket specification to use to connect to the server
* @param subprotocol
* Sub protocol request sent to the server.
* @param customHeaders
* Map of custom headers to add to the client request
* @param maxFramePayloadLength
* Maximum length of a frame's payload
*/
protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
HttpHeaders customHeaders, int maxFramePayloadLength) {
this(uri, version, subprotocol, customHeaders, maxFramePayloadLength, DEFAULT_FORCE_CLOSE_TIMEOUT_MILLIS);
}
/**
* Base constructor
*
* @param uri
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param version
* Version of web socket specification to use to connect to the server
* @param subprotocol
* Sub protocol request sent to the server.
* @param customHeaders
* Map of custom headers to add to the client request
* @param maxFramePayloadLength
* Maximum length of a frame's payload
* @param forceCloseTimeoutMillis
* Close the connection if it was not closed by the server after timeout specified
*/
protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
HttpHeaders customHeaders, int maxFramePayloadLength,
long forceCloseTimeoutMillis) {
this(uri, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis, false);
}
/**
* Base constructor
*
* @param uri
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param version
* Version of web socket specification to use to connect to the server
* @param subprotocol
* Sub protocol request sent to the server.
* @param customHeaders
* Map of custom headers to add to the client request
* @param maxFramePayloadLength
* Maximum length of a frame's payload
* @param forceCloseTimeoutMillis
* Close the connection if it was not closed by the server after timeout specified
* @param absoluteUpgradeUrl
* Use an absolute url for the Upgrade request, typically when connecting through an HTTP proxy over
* clear HTTP
*/
protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
HttpHeaders customHeaders, int maxFramePayloadLength,
long forceCloseTimeoutMillis, boolean absoluteUpgradeUrl) {
this(uri, version, subprotocol, customHeaders, maxFramePayloadLength, forceCloseTimeoutMillis,
absoluteUpgradeUrl, true);
}
/**
* Base constructor
*
* @param uri
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param version
* Version of web socket specification to use to connect to the server
* @param subprotocol
* Sub protocol request sent to the server.
* @param customHeaders
* Map of custom headers to add to the client request
* @param maxFramePayloadLength
* Maximum length of a frame's payload
* @param forceCloseTimeoutMillis
* Close the connection if it was not closed by the server after timeout specified
* @param absoluteUpgradeUrl
* Use an absolute url for the Upgrade request, typically when connecting through an HTTP proxy over
* clear HTTP
* @param generateOriginHeader
* Allows to generate the `Origin`|`Sec-WebSocket-Origin` header value for handshake request
* according to the given webSocketURL
*/
protected WebSocketClientHandshaker(URI uri, WebSocketVersion version, String subprotocol,
HttpHeaders customHeaders, int maxFramePayloadLength,
long forceCloseTimeoutMillis, boolean absoluteUpgradeUrl, boolean generateOriginHeader) {
this.uri = uri;
this.version = version;
expectedSubprotocol = subprotocol;
this.customHeaders = customHeaders;
this.maxFramePayloadLength = maxFramePayloadLength;
this.forceCloseTimeoutMillis = forceCloseTimeoutMillis;
this.absoluteUpgradeUrl = absoluteUpgradeUrl;
this.generateOriginHeader = generateOriginHeader;
}
/**
* Returns the URI to the web socket. e.g. "ws://myhost.com/path"
*/
public URI uri() {
return uri;
}
/**
* Version of the web socket specification that is being used
*/
public WebSocketVersion version() {
return version;
}
/**
* Returns the max length for any frame's payload
*/
public int maxFramePayloadLength() {
return maxFramePayloadLength;
}
/**
* Flag to indicate if the opening handshake is complete
*/
public boolean isHandshakeComplete() {
return handshakeComplete;
}
private void setHandshakeComplete() {
handshakeComplete = true;
}
/**
* Returns the CSV of requested subprotocol(s) sent to the server as specified in the constructor
*/
public String expectedSubprotocol() {
return expectedSubprotocol;
}
/**
* Returns the subprotocol response sent by the server. Only available after end of handshake.
* Null if no subprotocol was requested or confirmed by the server.
*/
public String actualSubprotocol() {
return actualSubprotocol;
}
private void setActualSubprotocol(String actualSubprotocol) {
this.actualSubprotocol = actualSubprotocol;
}
public long forceCloseTimeoutMillis() {
return forceCloseTimeoutMillis;
}
/**
* Flag to indicate if the closing handshake was initiated because of timeout.
* For testing only.
*/
protected boolean isForceCloseComplete() {
return forceCloseComplete;
}
/**
* Sets timeout to close the connection if it was not closed by the server.
*
* @param forceCloseTimeoutMillis
* Close the connection if it was not closed by the server after timeout specified
*/
public WebSocketClientHandshaker setForceCloseTimeoutMillis(long forceCloseTimeoutMillis) {
this.forceCloseTimeoutMillis = forceCloseTimeoutMillis;
return this;
}
/**
* Begins the opening handshake
*
* @param channel
* Channel
*/
public ChannelFuture handshake(Channel channel) {
ObjectUtil.checkNotNull(channel, "channel");
return handshake(channel, channel.newPromise());
}
/**
* Begins the opening handshake
*
* @param channel
* Channel
* @param promise
* the {@link ChannelPromise} to be notified when the opening handshake is sent
*/
public final ChannelFuture handshake(Channel channel, final ChannelPromise promise) {
ChannelPipeline pipeline = channel.pipeline();
HttpResponseDecoder decoder = pipeline.get(HttpResponseDecoder.class);
if (decoder == null) {
HttpClientCodec codec = pipeline.get(HttpClientCodec.class);
if (codec == null) {
promise.setFailure(new IllegalStateException("ChannelPipeline does not contain " +
"an HttpResponseDecoder or HttpClientCodec"));
return promise;
}
}
if (uri.getHost() == null) {
if (customHeaders == null || !customHeaders.contains(HttpHeaderNames.HOST)) {
promise.setFailure(new IllegalArgumentException("Cannot generate the 'host' header value," +
" webSocketURI should contain host or passed through customHeaders"));
return promise;
}
if (generateOriginHeader && !customHeaders.contains(HttpHeaderNames.ORIGIN)) {
final String originName;
if (version == WebSocketVersion.V07 || version == WebSocketVersion.V08) {
originName = HttpHeaderNames.SEC_WEBSOCKET_ORIGIN.toString();
} else {
originName = HttpHeaderNames.ORIGIN.toString();
}
promise.setFailure(new IllegalArgumentException("Cannot generate the '" + originName + "' header" +
" value, webSocketURI should contain host or disable generateOriginHeader or pass value" +
" through customHeaders"));
return promise;
}
}
FullHttpRequest request = newHandshakeRequest();
channel.writeAndFlush(request).addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) {
if (future.isSuccess()) {
ChannelPipeline p = future.channel().pipeline();
ChannelHandlerContext ctx = p.context(HttpRequestEncoder.class);
if (ctx == null) {
ctx = p.context(HttpClientCodec.class);
}
if (ctx == null) {
promise.setFailure(new IllegalStateException("ChannelPipeline does not contain " +
"an HttpRequestEncoder or HttpClientCodec"));
return;
}
p.addAfter(ctx.name(), "ws-encoder", newWebSocketEncoder());
promise.setSuccess();
} else {
promise.setFailure(future.cause());
}
}
});
return promise;
}
/**
* Returns a new {@link FullHttpRequest) which will be used for the handshake.
*/
protected abstract FullHttpRequest newHandshakeRequest();
/**
* Validates and finishes the opening handshake initiated by {@link #handshake}}.
*
* @param channel
* Channel
* @param response
* HTTP response containing the closing handshake details
*/
public final void finishHandshake(Channel channel, FullHttpResponse response) {
verify(response);
// Verify the subprotocol that we received from the server.
// This must be one of our expected subprotocols - or null/empty if we didn't want to speak a subprotocol
String receivedProtocol = response.headers().get(HttpHeaderNames.SEC_WEBSOCKET_PROTOCOL);
receivedProtocol = receivedProtocol != null ? receivedProtocol.trim() : null;
String expectedProtocol = expectedSubprotocol != null ? expectedSubprotocol : "";
boolean protocolValid = false;
if (expectedProtocol.isEmpty() && receivedProtocol == null) {
// No subprotocol required and none received
protocolValid = true;
setActualSubprotocol(expectedSubprotocol); // null or "" - we echo what the user requested
} else if (!expectedProtocol.isEmpty() && receivedProtocol != null && !receivedProtocol.isEmpty()) {
// We require a subprotocol and received one -> verify it
for (String protocol : expectedProtocol.split(",")) {
if (protocol.trim().equals(receivedProtocol)) {
protocolValid = true;
setActualSubprotocol(receivedProtocol);
break;
}
}
} // else mixed cases - which are all errors
if (!protocolValid) {
throw new WebSocketClientHandshakeException(String.format(
"Invalid subprotocol. Actual: %s. Expected one of: %s",
receivedProtocol, expectedSubprotocol), response);
}
setHandshakeComplete();
final ChannelPipeline p = channel.pipeline();
// Remove decompressor from pipeline if its in use
HttpContentDecompressor decompressor = p.get(HttpContentDecompressor.class);
if (decompressor != null) {
p.remove(decompressor);
}
// Remove aggregator if present before
HttpObjectAggregator aggregator = p.get(HttpObjectAggregator.class);
if (aggregator != null) {
p.remove(aggregator);
}
ChannelHandlerContext ctx = p.context(HttpResponseDecoder.class);
if (ctx == null) {
ctx = p.context(HttpClientCodec.class);
if (ctx == null) {
throw new IllegalStateException("ChannelPipeline does not contain " +
"an HttpRequestEncoder or HttpClientCodec");
}
final HttpClientCodec codec = (HttpClientCodec) ctx.handler();
// Remove the encoder part of the codec as the user may start writing frames after this method returns.
codec.removeOutboundHandler();
p.addAfter(ctx.name(), "ws-decoder", newWebsocketDecoder());
// Delay the removal of the decoder so the user can setup the pipeline if needed to handle
// WebSocketFrame messages.
// See https://github.com/netty/netty/issues/4533
channel.eventLoop().execute(new Runnable() {
@Override
public void run() {
p.remove(codec);
}
});
} else {
if (p.get(HttpRequestEncoder.class) != null) {
// Remove the encoder part of the codec as the user may start writing frames after this method returns.
p.remove(HttpRequestEncoder.class);
}
final ChannelHandlerContext context = ctx;
p.addAfter(context.name(), "ws-decoder", newWebsocketDecoder());
// Delay the removal of the decoder so the user can setup the pipeline if needed to handle
// WebSocketFrame messages.
// See https://github.com/netty/netty/issues/4533
channel.eventLoop().execute(new Runnable() {
@Override
public void run() {
p.remove(context.handler());
}
});
}
}
/**
* Process the opening handshake initiated by {@link #handshake}}.
*
* @param channel
* Channel
* @param response
* HTTP response containing the closing handshake details
* @return future
* the {@link ChannelFuture} which is notified once the handshake completes.
*/
public final ChannelFuture processHandshake(final Channel channel, HttpResponse response) {
return processHandshake(channel, response, channel.newPromise());
}
/**
* Process the opening handshake initiated by {@link #handshake}}.
*
* @param channel
* Channel
* @param response
* HTTP response containing the closing handshake details
* @param promise
* the {@link ChannelPromise} to notify once the handshake completes.
* @return future
* the {@link ChannelFuture} which is notified once the handshake completes.
*/
public final ChannelFuture processHandshake(final Channel channel, HttpResponse response,
final ChannelPromise promise) {
if (response instanceof FullHttpResponse) {
try {
finishHandshake(channel, (FullHttpResponse) response);
promise.setSuccess();
} catch (Throwable cause) {
promise.setFailure(cause);
}
} else {
ChannelPipeline p = channel.pipeline();
ChannelHandlerContext ctx = p.context(HttpResponseDecoder.class);
if (ctx == null) {
ctx = p.context(HttpClientCodec.class);
if (ctx == null) {
return promise.setFailure(new IllegalStateException("ChannelPipeline does not contain " +
"an HttpResponseDecoder or HttpClientCodec"));
}
}
String aggregatorCtx = ctx.name();
// Content-Length and Transfer-Encoding must not be sent in any response with a status code of 1xx or 204.
if (version == WebSocketVersion.V00) {
// Add aggregator and ensure we feed the HttpResponse so it is aggregated. A limit of 8192 should be
// more then enough for the websockets handshake payload.
aggregatorCtx = "httpAggregator";
p.addAfter(ctx.name(), aggregatorCtx, new HttpObjectAggregator(8192));
}
p.addAfter(aggregatorCtx, "handshaker", new ChannelInboundHandlerAdapter() {
private FullHttpResponse fullHttpResponse;
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
if (msg instanceof HttpObject) {
try {
handleHandshakeResponse(ctx, (HttpObject) msg);
} finally {
ReferenceCountUtil.release(msg);
}
} else {
super.channelRead(ctx, msg);
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
// Remove ourself and fail the handshake promise.
ctx.pipeline().remove(this);
promise.setFailure(cause);
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
try {
// Fail promise if Channel was closed
if (!promise.isDone()) {
promise.tryFailure(new ClosedChannelException());
}
ctx.fireChannelInactive();
} finally {
releaseFullHttpResponse();
}
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
releaseFullHttpResponse();
}
private void handleHandshakeResponse(ChannelHandlerContext ctx, HttpObject response) {
if (response instanceof FullHttpResponse) {
ctx.pipeline().remove(this);
tryFinishHandshake((FullHttpResponse) response);
return;
}
if (response instanceof LastHttpContent) {
assert fullHttpResponse != null;
FullHttpResponse handshakeResponse = fullHttpResponse;
fullHttpResponse = null;
try {
ctx.pipeline().remove(this);
tryFinishHandshake(handshakeResponse);
} finally {
handshakeResponse.release();
}
return;
}
if (response instanceof HttpResponse) {
HttpResponse httpResponse = (HttpResponse) response;
fullHttpResponse = new DefaultFullHttpResponse(httpResponse.protocolVersion(),
httpResponse.status(), Unpooled.EMPTY_BUFFER, httpResponse.headers(),
EmptyHttpHeaders.INSTANCE);
if (httpResponse.decoderResult().isFailure()) {
fullHttpResponse.setDecoderResult(httpResponse.decoderResult());
}
}
}
private void tryFinishHandshake(FullHttpResponse fullHttpResponse) {
try {
finishHandshake(channel, fullHttpResponse);
promise.setSuccess();
} catch (Throwable cause) {
promise.setFailure(cause);
}
}
private void releaseFullHttpResponse() {
if (fullHttpResponse != null) {
fullHttpResponse.release();
fullHttpResponse = null;
}
}
});
try {
ctx.fireChannelRead(ReferenceCountUtil.retain(response));
} catch (Throwable cause) {
promise.setFailure(cause);
}
}
return promise;
}
/**
* Verify the {@link FullHttpResponse} and throws a {@link WebSocketHandshakeException} if something is wrong.
*/
protected abstract void verify(FullHttpResponse response);
/**
* Returns the decoder to use after handshake is complete.
*/
protected abstract WebSocketFrameDecoder newWebsocketDecoder();
/**
* Returns the encoder to use after the handshake is complete.
*/
protected abstract WebSocketFrameEncoder newWebSocketEncoder();
/**
* Performs the closing handshake.
*
* When called from within a {@link ChannelHandler} you most likely want to use
* {@link #close(ChannelHandlerContext, CloseWebSocketFrame)}.
*
* @param channel
* Channel
* @param frame
* Closing Frame that was received
*/
public ChannelFuture close(Channel channel, CloseWebSocketFrame frame) {
ObjectUtil.checkNotNull(channel, "channel");
return close(channel, frame, channel.newPromise());
}
/**
* Performs the closing handshake
*
* When called from within a {@link ChannelHandler} you most likely want to use
* {@link #close(ChannelHandlerContext, CloseWebSocketFrame, ChannelPromise)}.
*
* @param channel
* Channel
* @param frame
* Closing Frame that was received
* @param promise
* the {@link ChannelPromise} to be notified when the closing handshake is done
*/
public ChannelFuture close(Channel channel, CloseWebSocketFrame frame, ChannelPromise promise) {
ObjectUtil.checkNotNull(channel, "channel");
return close0(channel, channel, frame, promise);
}
/**
* Performs the closing handshake
*
* @param ctx
* the {@link ChannelHandlerContext} to use.
* @param frame
* Closing Frame that was received
*/
public ChannelFuture close(ChannelHandlerContext ctx, CloseWebSocketFrame frame) {
ObjectUtil.checkNotNull(ctx, "ctx");
return close(ctx, frame, ctx.newPromise());
}
/**
* Performs the closing handshake
*
* @param ctx
* the {@link ChannelHandlerContext} to use.
* @param frame
* Closing Frame that was received
* @param promise
* the {@link ChannelPromise} to be notified when the closing handshake is done
*/
public ChannelFuture close(ChannelHandlerContext ctx, CloseWebSocketFrame frame, ChannelPromise promise) {
ObjectUtil.checkNotNull(ctx, "ctx");
return close0(ctx, ctx.channel(), frame, promise);
}
private ChannelFuture close0(final ChannelOutboundInvoker invoker, final Channel channel,
CloseWebSocketFrame frame, ChannelPromise promise) {
invoker.writeAndFlush(frame, promise);
final long forceCloseTimeoutMillis = this.forceCloseTimeoutMillis;
final WebSocketClientHandshaker handshaker = this;
if (forceCloseTimeoutMillis <= 0 || !channel.isActive() || forceCloseInit != 0) {
return promise;
}
promise.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) {
// If flush operation failed, there is no reason to expect
// a server to receive CloseFrame. Thus this should be handled
// by the application separately.
// Also, close might be called twice from different threads.
if (future.isSuccess() && channel.isActive() &&
FORCE_CLOSE_INIT_UPDATER.compareAndSet(handshaker, 0, 1)) {
final Future forceCloseFuture = channel.eventLoop().schedule(new Runnable() {
@Override
public void run() {
if (channel.isActive()) {
invoker.close();
forceCloseComplete = true;
}
}
}, forceCloseTimeoutMillis, TimeUnit.MILLISECONDS);
channel.closeFuture().addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
forceCloseFuture.cancel(false);
}
});
}
}
});
return promise;
}
/**
* Return the constructed raw path for the give {@link URI}.
*/
protected String upgradeUrl(URI wsURL) {
if (absoluteUpgradeUrl) {
return wsURL.toString();
}
String path = wsURL.getRawPath();
path = path == null || path.isEmpty() ? "/" : path;
String query = wsURL.getRawQuery();
return query != null && !query.isEmpty() ? path + '?' + query : path;
}
static CharSequence websocketHostValue(URI wsURL) {
int port = wsURL.getPort();
if (port == -1) {
return wsURL.getHost();
}
String host = wsURL.getHost();
String scheme = wsURL.getScheme();
if (port == HttpScheme.HTTP.port()) {
return HttpScheme.HTTP.name().contentEquals(scheme)
|| WebSocketScheme.WS.name().contentEquals(scheme) ?
host : NetUtil.toSocketAddressString(host, port);
}
if (port == HttpScheme.HTTPS.port()) {
return HttpScheme.HTTPS.name().contentEquals(scheme)
|| WebSocketScheme.WSS.name().contentEquals(scheme) ?
host : NetUtil.toSocketAddressString(host, port);
}
// if the port is not standard (80/443) its needed to add the port to the header.
// See https://tools.ietf.org/html/rfc6454#section-6.2
return NetUtil.toSocketAddressString(host, port);
}
static CharSequence websocketOriginValue(URI wsURL) {
String scheme = wsURL.getScheme();
final String schemePrefix;
int port = wsURL.getPort();
final int defaultPort;
if (WebSocketScheme.WSS.name().contentEquals(scheme)
|| HttpScheme.HTTPS.name().contentEquals(scheme)
|| (scheme == null && port == WebSocketScheme.WSS.port())) {
schemePrefix = HTTPS_SCHEME_PREFIX;
defaultPort = WebSocketScheme.WSS.port();
} else {
schemePrefix = HTTP_SCHEME_PREFIX;
defaultPort = WebSocketScheme.WS.port();
}
// Convert uri-host to lower case (by RFC 6454, chapter 4 "Origin of a URI")
String host = wsURL.getHost().toLowerCase(Locale.US);
if (port != defaultPort && port != -1) {
// if the port is not standard (80/443) its needed to add the port to the header.
// See https://tools.ietf.org/html/rfc6454#section-6.2
return schemePrefix + NetUtil.toSocketAddressString(host, port);
}
return schemePrefix + host;
}
}
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